Online and distance learning :  concepts, methodologies, tools, and applications / 
Lawrence Tomei 
 - Hershey, PA. :  Information Science Reference,  2008 
 - 6 v. :  ill. ;  29 cm. 
<br/><br/><label>ISBN: </label>159904935X (hbk.)  RM912.00 9781599049359 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Distance education--United States